Lecture 3: Parasitic Nematodes of Humans (4/15)

Question 1

Neglected tropical diseases (NTDs)

Answer 1

Most prevalent infections of the poor, over 1 billion infected worldwide. Considered NTDs if there are many people infected but not much funding

Question 2

DALY

Answer 2

Disability adjusted life years

Question 3

Definitive/final host

Answer 3

The species within which the nematode parasite reaches sexual maturity and reproduces. An obligate host in the life cycle

An example of a non-definitive host would be one that only has its juvenile life cycle in humans, like Anisakis

Question 4

Intermediate host

Answer 4

A host species in which a nematode undergoes development but does not reach sexual maturity. An obligate host in the life cycle

Question 5

Paratenic/transport host

Answer 5

A host species within which the nematode survives but does not develop. Allow for transmission through the food chain via predation. May or may not be obligate

Some species may require a paratenic host but not a specific host species

Question 6

Onchocerciasis

Answer 6

River blindness - Onchocerca volvulus

Question 7

Ascariasis

Answer 7

Ascaris lumbricoides